Links

lots of interesting household activities, including making a microscope and chromatographyhttp:www.funsci.com/texts/index_en.htm

a page form the above that has chromatography, pigments, and othershttp:www.funsci.com/fun3_en/exper1/exper1.htm

fly media on the cheaphttp://stockcenter.arl.arizona.edu/index.php?option=com_content&task=view&id=28&Itemid=42

MicrobeWorld posts some microbiology experiments, several good ones, like 'can they tell the difference?'
http://www.microbeworld.org/resources/experiment.aspx

bread as a cheap medium, already inoculated with mold
http://www.microbeworld.org/resources/experiment/experiment_bread_bag_nightmares.aspx